To accurately predict long-term Cs activity concentrations in stem wood, it is crucial to assess whether the Cs cycle in forests has reached quasi-equilibrium between trees and forest soil. A method has been proposed to evaluate this equilibrium based on the concentration ratio of Cs to stable cesium (Cs) within the tree compartments. However, this assessment has not yet been conducted in the recent situation following the Fukushima accident. In this study, we investigated the relationship between the concentration ratios of Cs and Cs in tree leaves, inner bark, stem wood, and stemflow in a deciduous broad-leaved forest at Kawauchi Village, the Fukushima Prefecture, as of 2022-2023. Our comparisons between Cs and Cs concentrations revealed that Cs/Cs concentration ratios were constant in the above-ground compartment and stemflow, suggesting that the cycle of Cs in the Fukushima forest has reached quasi-equilibrium 11-12 years after the accident. This concentration ratio-based assessment for quasi-equilibrium may be applicable to forest sites where long-term monitoring is not conducted.
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